Which performance counter should you use?

Explanation/Reference:
Note:
* From Scenario:
Monitor whether a large number of documents are checked out.
Monitor whether a large number of unpublished items are being requested.
Publishing cache hit ratio
A low ratio can indicate that unpublished items are being requested, and these cannot be cached. If this is a portal site, the site might be set to require check-out, or many users have items checked out.
Reference: Monitor cache performance in SharePoint 2013